Synthesis of Homogeneous La0.8Sr0.2CrO3 Powders Using an Ultrasonic Spray Pyrolysis Method

  • Kim, Chang-Sam ;
  • Hwang, Seong-Ik ;
  • Kim, Shin-Woo
  • Published : 2007.05.31


A process to synthesize $La_{0.8}Sr_{0.2}CrO_3$ (LSC), which is a promising material for use as a separator in a soild oxide fuel cell, is investigated in this study. LSC powders without secondary Phases could be synthesized with ultrasonic spray pyrolysis and a heat treatment at $1200^{\circ}C$ for 20 h; however, it showed an average diameter of $0.6{\mu}m$ with a wide particle size distribution. On the other hand, LSC powders synthesized with spray pyrolysis at $800^{\circ}C$, heat-treated at $900^{\circ}C$ for 5 h, ball-milled and finally heat-treated again at $1200^{\circ}C$ for 20 h showed a smaller average diameter of $0.3{\mu}m$ and narrower size distribution. Very few particles above $0.5{\mu}m$ were found. Thus, a proper combination of the heat treatment and milling process after spray pyrolysis it determined to be very important in synthesizing fine and uniform LSC perovskite powders.


Solid oxide fuel cell;$La_{0.8}Sr_{0.2}CrO_3$;Separator;Ultrasonic spray pyrolysis


  1. M. Mori, Y. Hiei, and N. M. Sammes, 'Sintering Behavior and Mechanism of Sr-Doped Lanthanum Chromites with A Site Excess Composition in Air,' Solid State Ion., 123 103-11 (1999)
  2. D. P. Karim and A. T. Aldred, 'LocalizeD Level Hopping Transport in $La(Sr)CrO_3$,' Phys. Rev. B, 20 [6] 2255-63 (1979)
  3. H. C. Graham and H. H. Davis, 'Oxidation/Vaporization Kinetics of $Cr_2O_3$,' J. Am. Ceram. Soc., 54 [2] 89-93 (1971)
  4. B. Dubois, D. Ruffier, and P. Odier, 'Preparation of Fine, Spherical Yttria-Stabilized Zirconia by the Spray-Pyrolysis Method,' J. Am. Ceram. Soc., 72 [4] 713-15 (1989)
  5. H. Ishizawa, O. Sakurai, N. Mitzutani, and M. Kato, 'Homogeneous $Y_2O_3$-Stabilized $ZrO_2$ Powder by Spray Pyrolysis Method,' Am. Ceram. Soc. Bull., 65 [10] 1399-404 (1986)
  6. R. L. Peskin and R. J. Raco, 'Ultrasonic Atomization of Liquids,' J. Acoust. Soc. Am., 35 1378-81 (1963)
  7. I. Taniguchi, D. Song, and M. Wakihara, 'Electrochemical Properties of $LiM_{1/6}Mn_{11/6}O_4$ (M=Mn, Co, Al and Ni) as Cathode Materials for Li-ion Batteries Prepared by Ultrasonic Spray Pyrolysis Method,' J. Power Sources, 109 [2] 333-39 (2002)
  8. M. Mori, T. Yamamoto, T. Ichikawa, and Y. Takeda, 'Dense Sintered Conditions and Sintering Mechanisms for Alkaline Earth Metal (Mg, Ca and Sr)-Doped LaCrO3 Perovskites under Reducing Atmosphere,' Solid State Ion., 148 93-101 (2002)